Alex Hunsaker napsal(a):
wide:
# NOTE not on the same machine as the "narrow" test was run!
# spit out 2, 000, 000 random 100 length strings
perl gen.pl > data.sql
create table test_hash (wide text);
copy test_hash from './data.sql';
create index test_hash_num_idx on test_hash using hash (wide);
bench.sql:
select a.wide from test_hash as a inner join test_hash as b on b.wide
= a.wide where a.wide =
'BJNORSLMITGKHJCWDBLKLYRSJTVPTYXZJPWNBKXGHYFNDHRAKNFMDHRMUXLDXNTRBJMTHPGPBFJZPAENZXDHAHCUSCJTUPUXWCXUH';
# ^ that string is in data.sql
# 3 runs each
pgbench -c1 -n -t100000 -f bench.sql
cvs head: tps = 5073.463498, 5110.620923, 4955.347610
v5: tps = 5870.681336, 5740.007837, 5699.002942
What locale did you use? It would be nice to have also comparing between
C and any UTF8 locale. I think we should see big benefit when non C
locale is used.
Thanks Zdenek
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